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Nagatsuma, T., Hirata, A., Sato, Y., Yamaguchi, R., Takahashi, H., Kosugi, T., et al. (2005). Sub-Terahertz Wireless Communications Technologies. In Proc. 18th International Conference on Applied Electromagnetics and Communications (ICECom 2005) (pp. 1–4).
Abstract: This paper presents a 10-Gb/s wireless link system that uses a 120-GHz-band sub-terahertz electro-magnetic waves. In the transmitter, photonic techniques are used for generation, modulation, and emission of the sub-THz signals, while the receiver is composed of all-electronic devices using InP-HEMTs.
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Nagatsuma, T., Hirata, A., Royter, Y., Shinagawa, M., Furuta, T., Ishibashi, T., et al. (2000). A 120-GHz integrated photonic transmitter. In Proc. International topical meeting on microwave photonics (MWP 2000) (pp. 225–228).
Abstract: A photonics-based 120-GHz transmitter has been developed. A photodiode, a planar antenna and a silicon lens were integrated to form a compact millimeter-wave (MMW) emitter. The MMW signal emitted from the transmitter has been detected with a waveguide-mounted Schottky diode. The received power exceeded 100 μW, which is the highest value ever reported for photonic MMW transmitter at frequencies of >100 GHz
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Шангина, Е. Л., Смирнов, К. В., Морозов, Д. В., Ковалюк, В. В., Гольцман, Г. Н., Веревкин, А. А., et al. (2010). Полоса и потери преобразования полупроводникового смесителя с фононным каналом охлаждения двумерных электронов. Физика и техника полупроводников, 44(11), 1475–1478.
Abstract: Методом субмиллиметровой спектроскопии с высоким временным разрешением измерены температурная и концентрационная зависимости полосы преобразования смесителей терагерцового диапазона AlGaAs/GaAs на разогреве двумерных электронов с фононным каналом их охлаждения. Полоса преобразования на уровне 3 дБ (f3 dB) при 4.2 K при изменении концентрации ns варьируется в пределах 150-250 МГц в соответствии со степенным законом f3 dB propto ns-0.5, что соответствует доминирующему механизму рассеяния на пьезоэлектрических фононах. Минимальное значение коэффициента потерь преобразования полупроводникового смесителя достигается в структурах с высокой подвижностью носителей mu>3·105 см2/В·с при 4.2 K.
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Nebosis, R. S., Semenov, A. D., Gousev, Y. P., & Renk, K. F. (1996). Rigorous analysis of a superconducting hot-electron bolometer mixer: theory and comparision with experiment. In Proc. 7th Int. Symp. Space Terahertz Technol. (pp. 601–613). Charlottesville, Virginia, USA.
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Karpov, A., Miller, D., Stern, J. A., Bumble, B., LeDuc, H. G., & Zmuidzinas, J. (2009). Broadband SIS mixer for 1 THz Band. In Proc. 20th Int. Symp. Space Terahertz Technol. (p. 35).
Abstract: We report the development of a low noise and broadband SIS mixer aimed for 1 THz channel of the Caltech Airborne Submillimeter Interstellar Medium Investigations Receiver (CASIMIR), designed for the Stratospheric Observatory for Far Infrared Astronomy, (SOFIA). The mixer uses an array of 0.24 µm² Nb/Al-AlN/NbTiN SIS junctions with critical current density of 30-50 KA/cm². The junctions are shaped in order to optimize the suppression of the Josephson DC currents. We are using a double slot planar antenna to couple the mixer chip with the telescope beam. The RF matching microcircuit is made using Nb and gold films. The mixer IF circuit is designed to cover 4 – 8 GHz band. A test receiver with the new mixer has a low noise operation in a 0.87 – 1.12 THz band. The minimum DSB receiver noise measured at 1 THz is 260 K (Y=1.64), apparently the lowest reported up to date. The receiver noise corrected for the loss in the LO injection beam splitter and in the cryostat window is 200 K. The combination of a broad operation band of about 250 GHz with a low receiver noise is making the new mixer a useful element for application at SOFIA. We will discuss the prospective of a further improvement of the sensitivity and extension of the upper frequency of operation of SIS mixer.
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